Likewise, a Wal-Mart spokeswoman said “Out of an abundance of caution, and in accordance with the CDC Advisory, all products which may contain chopped romaine lettuce from the Yuma, AZ area have been removed from our shelves.”

Kroger also removed bagged salad items that contain romaine.

“As part of Kroger’s commitment to food safety, we proactively reach out to customers by phone, email and at the register if they are flagged as a person who has previously purchased this product,” a spokeswoman stated.

Symptoms of an E. coli infection vary but often include severe stomach cramps and (often bloody) diarrhea. Most people get better in five to seven days. Infections can be mild but can also be severe or life-threatening.

If you think you have E. coli, the CDC advises you to speak with your health care provider or public health department and write down what you ate in the week before you get sick.